From d86d66e0ac0c296d813e985217299a4a900a5e49 Mon Sep 17 00:00:00 2001
From: CGantert345 <57003061+CGantert345@users.noreply.github.com>
Date: Fri, 10 Feb 2023 14:22:57 +0100
Subject: new exception for wrong identifiers in U_HEAD

---
 src/main/java/org/uic/barcode/staticFrame/UHEADDataRecord.java | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/main/java/org/uic/barcode/staticFrame/UHEADDataRecord.java b/src/main/java/org/uic/barcode/staticFrame/UHEADDataRecord.java
index 22ba8ce..fdef178 100644
--- a/src/main/java/org/uic/barcode/staticFrame/UHEADDataRecord.java
+++ b/src/main/java/org/uic/barcode/staticFrame/UHEADDataRecord.java
@@ -224,6 +224,16 @@ public class UHEADDataRecord extends DataRecord{
 	        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
 	    	
   	     	String issuerElement = String.format("%4s", this.issuer);
+  	     	
+  	     	if (this.identifier == null || this.identifier.length() < 1) {
+  	     		throw new EncodingFormatException("Identifier in U_HEAD missing");
+  	     	}  
+  	     	
+  	     	if (this.identifier.length() > 20) {
+  	     		throw new EncodingFormatException("Identifier in U_HEAD too long (max. 20 byte)");
+  	     	}
+	     	
+  	     	
 
 			String idElement = String.format("%20s", this.identifier);
 			
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